Footnotes

• Twitter @KristineAllin, @J_Kirchgesner

• Correction notice This article has been corrected since it published Online First. The affiliations for Kristine Højgaard Allin and Tine Jess have been updated.

• Contributors JK, DW and MA: had full access to all the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis. All authors: concept and design, acquisition, analysis or interpretation of data and critical revision of the manuscript for important intellectual content. DW: drafting of the manuscript. DW, MA, TJ and JK: statistical analysis. TJ and JK: supervision and co-last authors.

• Competing interests JK received lecture fees from Pfizer and consulting fees from Roche, Pfizer and Gilead. LB received consulting fees from BMS, Janssen and Mylan; lecture fees from AbbVie, BMS, Janssen, MSD, Ferring and Takeda and research support from AbbVie, Celltrion, Ferring Pharmaceuticals, Hospira-Pfizer, Janssen, MSD, Mylan, Takeda and Tillotts.

• Provenance and peer review Not commissioned; externally peer reviewed.

• Supplemental material This content has been supplied by the author(s). It has not been vetted by BMJ Publishing Group Limited (BMJ) and may not have been peer-reviewed. Any opinions or recommendations discussed are solely those of the author(s) and are not endorsed by BMJ. BMJ disclaims all liability and responsibility arising from any reliance placed on the content. Where the content includes any translated material, BMJ does not warrant the accuracy and reliability of the translations (including but not limited to local regulations, clinical guidelines, terminology, drug names and drug dosages), and is not responsible for any error and/or omissions arising from translation and adaptation or otherwise.